package com.runningracehisotry.views;

/*
 * Copyright (C) 2007 The Android Open Source Project
 * Copyright (C) 2013 Ivan Kovac navratnanos@gmail.com
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import java.text.DateFormatSymbols;
import java.util.Calendar;

import com.runningracehisotry.R;

import android.content.Context;
import android.os.Parcel;
import android.os.Parcelable;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.Button;
import android.widget.FrameLayout;
import android.widget.NumberPicker;
import android.widget.NumberPicker.Formatter;

/**
 * A view for selecting the time of day, in either 24 hour or AM/PM mode.
 *
 * The hour, each minute digit, each seconds digit, and AM/PM (if applicable)
 * can be conrolled by vertical spinners.
 *
 * The hour can be entered by keyboard input. Entering in two digit hours can be
 * accomplished by hitting two digits within a timeout of about a second (e.g.
 * '1' then '2' to select 12).
 *
 * The minutes can be entered by entering single digits. The seconds can be
 * entered by entering single digits.
 *
 * Under AM/PM mode, the user can hit 'a', 'A", 'p' or 'P' to pick.
 *
 * For a dialog using this view, see {@link android.app.TimePickerDialog}.
 */
public class TimePicker extends FrameLayout {

	/**
	 * A no-op callback used in the constructor to avoid null checks later in
	 * the code.
	 */
	private static final OnTimeChangedListener NO_OP_CHANGE_LISTENER = new OnTimeChangedListener() {
		public void onTimeChanged(TimePicker view, int hourOfDay, int minute,
				int seconds) {
		}
	};

	public static final NumberPicker.Formatter TWO_DIGIT_FORMATTER = new Formatter() {

		@Override
		public String format(int value) {
			// TODO Auto-generated method stub
			return String.format("%02d", value);
		}
	};

	// state
	private int mCurrentHour = 0; // 0-23
	private int mCurrentMinute = 0; // 0-59
	private int mCurrentSeconds = 0; // 0-59
	private Boolean mIs24HourView = false;
	private boolean mIsAm;

	// ui components
	private final NumberPicker mHourPicker;
	private final NumberPicker mMinutePicker;
	private final NumberPicker mSecondPicker;
	private final Button mAmPmButton;
	private final String mAmText;
	private final String mPmText;

	// callbacks
	private OnTimeChangedListener mOnTimeChangedListener;

	/**
	 * The callback interface used to indicate the time has been adjusted.
	 */
	public interface OnTimeChangedListener {

		/**
		 * @param view
		 *            The view associated with this listener.
		 * @param hourOfDay
		 *            The current hour.
		 * @param minute
		 *            The current minute.
		 * @param seconds
		 *            The current second.
		 */
		void onTimeChanged(TimePicker view, int hourOfDay, int minute,
				int seconds);
	}

	public TimePicker(Context context) {
		this(context, null);
	}

	public TimePicker(Context context, AttributeSet attrs) {
		this(context, attrs, 0);
	}

	public TimePicker(Context context, AttributeSet attrs, int defStyle) {
		super(context, attrs, defStyle);

		LayoutInflater inflater = (LayoutInflater) context
				.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
		inflater.inflate(R.layout.time_picker_widget, this, // we are the parent
				true);

		// hour
		mHourPicker = (NumberPicker) findViewById(R.id.hour);
		mHourPicker
				.setOnValueChangedListener(new NumberPicker.OnValueChangeListener() {

					@Override
					public void onValueChange(NumberPicker picker, int oldVal,
							int newVal) {
						// TODO Auto-generated method stub
						mCurrentHour = newVal;
						if (!mIs24HourView) {
							// adjust from [1-12] to [0-11] internally, with the
							// times
							// written "12:xx" being the start of the half-day
							if (mCurrentHour == 12) {
								mCurrentHour = 0;
							}
							if (!mIsAm) {
								// PM means 12 hours later than nominal
								mCurrentHour += 12;
							}
						}
						onTimeChanged();
					}
				});

		// digits of minute
		mMinutePicker = (NumberPicker) findViewById(R.id.minute);
		mMinutePicker.setMinValue(0);
		mMinutePicker.setMaxValue(59);
		mMinutePicker.setFormatter(TWO_DIGIT_FORMATTER);
		mMinutePicker
				.setOnValueChangedListener(new NumberPicker.OnValueChangeListener() {
					@Override
					public void onValueChange(NumberPicker spinner, int oldVal,
							int newVal) {
						mCurrentMinute = newVal;
						onTimeChanged();
					}
				});

		// digits of seconds
		mSecondPicker = (NumberPicker) findViewById(R.id.seconds);
		mSecondPicker.setMinValue(0);
		mSecondPicker.setMaxValue(59);
		mSecondPicker.setFormatter(TWO_DIGIT_FORMATTER);
		mSecondPicker
				.setOnValueChangedListener(new NumberPicker.OnValueChangeListener() {

					@Override
					public void onValueChange(NumberPicker picker, int oldVal,
							int newVal) {
						mCurrentSeconds = newVal;
						onTimeChanged();

					}
				});

		// am/pm
		mAmPmButton = (Button) findViewById(R.id.amPm);

		// now that the hour/minute picker objects have been initialized, set
		// the hour range properly based on the 12/24 hour display mode.
		configurePickerRanges();

		// initialize to current time
		Calendar cal = Calendar.getInstance();
		setOnTimeChangedListener(NO_OP_CHANGE_LISTENER);

		// by default we're not in 24 hour mode
		setCurrentHour(cal.get(Calendar.HOUR_OF_DAY));
		setCurrentMinute(cal.get(Calendar.MINUTE));
		setCurrentSecond(cal.get(Calendar.SECOND));

		mIsAm = (mCurrentHour < 12);

		/* Get the localized am/pm strings and use them in the spinner */
		DateFormatSymbols dfs = new DateFormatSymbols();
		String[] dfsAmPm = dfs.getAmPmStrings();
		mAmText = dfsAmPm[Calendar.AM];
		mPmText = dfsAmPm[Calendar.PM];
		mAmPmButton.setText(mIsAm ? mAmText : mPmText);
		mAmPmButton.setOnClickListener(new OnClickListener() {
			public void onClick(View v) {
				requestFocus();
				if (mIsAm) {

					// Currently AM switching to PM
					if (mCurrentHour < 12) {
						mCurrentHour += 12;
					}
				} else {

					// Currently PM switching to AM
					if (mCurrentHour >= 12) {
						mCurrentHour -= 12;
					}
				}
				mIsAm = !mIsAm;
				mAmPmButton.setText(mIsAm ? mAmText : mPmText);
				onTimeChanged();
			}
		});

		if (!isEnabled()) {
			setEnabled(false);
		}
	}

	@Override
	public void setEnabled(boolean enabled) {
		super.setEnabled(enabled);
		mMinutePicker.setEnabled(enabled);
		mHourPicker.setEnabled(enabled);
		mAmPmButton.setEnabled(enabled);
	}

	/**
	 * Used to save / restore state of time picker
	 */
	private static class SavedState extends BaseSavedState {

		private final int mHour;
		private final int mMinute;

		private SavedState(Parcelable superState, int hour, int minute) {
			super(superState);
			mHour = hour;
			mMinute = minute;
		}

		private SavedState(Parcel in) {
			super(in);
			mHour = in.readInt();
			mMinute = in.readInt();
		}

		public int getHour() {
			return mHour;
		}

		public int getMinute() {
			return mMinute;
		}

		@Override
		public void writeToParcel(Parcel dest, int flags) {
			super.writeToParcel(dest, flags);
			dest.writeInt(mHour);
			dest.writeInt(mMinute);
		}

		@SuppressWarnings("unused")
		public static final Parcelable.Creator<SavedState> CREATOR = new Creator<SavedState>() {
			public SavedState createFromParcel(Parcel in) {
				return new SavedState(in);
			}

			public SavedState[] newArray(int size) {
				return new SavedState[size];
			}
		};
	}

	@Override
	protected Parcelable onSaveInstanceState() {
		Parcelable superState = super.onSaveInstanceState();
		return new SavedState(superState, mCurrentHour, mCurrentMinute);
	}

	@Override
	protected void onRestoreInstanceState(Parcelable state) {
		SavedState ss = (SavedState) state;
		super.onRestoreInstanceState(ss.getSuperState());
		setCurrentHour(ss.getHour());
		setCurrentMinute(ss.getMinute());
	}

	/**
	 * Set the callback that indicates the time has been adjusted by the user.
	 * 
	 * @param onTimeChangedListener
	 *            the callback, should not be null.
	 */
	public void setOnTimeChangedListener(
			OnTimeChangedListener onTimeChangedListener) {
		mOnTimeChangedListener = onTimeChangedListener;
	}

	/**
	 * @return The current hour (0-23).
	 */
	public Integer getCurrentHour() {
		return mCurrentHour;
	}

	/**
	 * Set the current hour.
	 */
	public void setCurrentHour(Integer currentHour) {
		this.mCurrentHour = currentHour;
		updateHourDisplay();
	}

	/**
	 * Set whether in 24 hour or AM/PM mode.
	 * 
	 * @param is24HourView
	 *            True = 24 hour mode. False = AM/PM.
	 */
	public void setIs24HourView(Boolean is24HourView) {
		if (mIs24HourView != is24HourView) {
			mIs24HourView = is24HourView;
			configurePickerRanges();
			updateHourDisplay();
		}
	}

	/**
	 * @return true if this is in 24 hour view else false.
	 */
	public boolean is24HourView() {
		return mIs24HourView;
	}

	/**
	 * @return The current minute.
	 */
	public Integer getCurrentMinute() {
		return mCurrentMinute;
	}

	/**
	 * Set the current minute (0-59).
	 */
	public void setCurrentMinute(Integer currentMinute) {
		this.mCurrentMinute = currentMinute;
		updateMinuteDisplay();
	}

	/**
	 * @return The current minute.
	 */
	public Integer getCurrentSeconds() {
		return mCurrentSeconds;
	}

	/**
	 * Set the current second (0-59).
	 */
	public void setCurrentSecond(Integer currentSecond) {
		this.mCurrentSeconds = currentSecond;
		updateSecondsDisplay();
	}

	@Override
	public int getBaseline() {
		return mHourPicker.getBaseline();
	}

	/**
	 * Set the state of the spinners appropriate to the current hour.
	 */
	private void updateHourDisplay() {
		int currentHour = mCurrentHour;
		if (!mIs24HourView) {
			// convert [0,23] ordinal to wall clock display
			if (currentHour > 12)
				currentHour -= 12;
			else if (currentHour == 0)
				currentHour = 12;
		}
		mHourPicker.setValue(currentHour);
		mIsAm = mCurrentHour < 12;
		mAmPmButton.setText(mIsAm ? mAmText : mPmText);
		onTimeChanged();
	}

	private void configurePickerRanges() {
		if (mIs24HourView) {
			mHourPicker.setMinValue(0);
			mHourPicker.setMaxValue(23);
			mHourPicker.setFormatter(TWO_DIGIT_FORMATTER);
			mAmPmButton.setVisibility(View.GONE);
		} else {
			mHourPicker.setMinValue(1);
			mHourPicker.setMaxValue(12);
			mHourPicker.setFormatter(null);
			mAmPmButton.setVisibility(View.VISIBLE);
		}
	}

	private void onTimeChanged() {
		mOnTimeChangedListener.onTimeChanged(this, getCurrentHour(),
				getCurrentMinute(), getCurrentSeconds());
	}

	/**
	 * Set the state of the spinners appropriate to the current minute.
	 */
	private void updateMinuteDisplay() {
		mMinutePicker.setValue(mCurrentMinute);
		mOnTimeChangedListener.onTimeChanged(this, getCurrentHour(),
				getCurrentMinute(), getCurrentSeconds());
	}

	/**
	 * Set the state of the spinners appropriate to the current second.
	 */
	private void updateSecondsDisplay() {
		mSecondPicker.setValue(mCurrentSeconds);
		mOnTimeChangedListener.onTimeChanged(this, getCurrentHour(),
				getCurrentMinute(), getCurrentSeconds());
	}
}
